| 摘要 |
The signal light baseplate has a rectangular recess in the top for a post of metal or tough plastics, while a signal plate or body is fixed to or fitted over the top end of the post (13). The latter is an M-shaped profile and its two lateral shanks (16) are of the same length. The shank length is approx. equal to that of the recess (15) in the transverse direction of the plate (11). The two central webs (17) are of the same length, extending from the junctions (18) with the shanks to the mid-point of the line joining the free ends (20) of the latter. |
